fix(cli): report unsupported model listing in json

Change-Id: I99fa70e7c0e6b5a574ebac55a1fbb2823b118f8b

Author: heimanba

packages/cli/src/commands/models.ts

@@ -9,7 +9,11 @@ export async function modelsListCommand(options: { file: string; provider?: stri
 	for (const listing of listings) {
 		const name = listing.provider;
 		if (!listing.supportsDynamicListing) {
-			if (!options.json) {
+			if (options.json) {
+				process.stdout.write(
+					`${JSON.stringify({ provider: name, supportsDynamicListing: false, models: [] }, null, 2)}\n`,
+				);
+			} else {
 				console.log(chalk.yellow(`\n  Provider '${name}' does not support dynamic model listing.`));
 				if (name === "claude") {
 					console.log(chalk.dim(`  Claude models are specified directly (e.g. claude-sonnet-4-6, claude-opus-4-6).`));

packages/cli/tests/unit/cli-contracts.test.ts

@@ -438,6 +438,21 @@ test("models list keeps missing config guidance in the core runtime", async () =
 	expect(result.stderr).toContain("File not found");
 });
 
+test("models list JSON reports providers without dynamic listing support", async () => {
+	const dir = await makeTempDir();
+	const configPath = await writeBailianVaultConfig(dir);
+
+	const result = await runAgents(["models", "list", "--file", configPath, "--provider", "bailian", "--json"]);
+
+	expect(result.exitCode).toBe(0);
+	expect(JSON.parse(result.stdout)).toEqual({
+		provider: "bailian",
+		supportsDynamicListing: false,
+		models: [],
+	});
+	expect(result.stderr).toBe("");
+});
+
 test("migrated CLI commands consume core service APIs instead of composing internals", async () => {
 	const commands = ["destroy.ts", "session.ts", "state.ts", "deployment.ts", "validate.ts", "models.ts"];
 	const banned = [